A discharge assembly for use with a flexible bag, e.g., a bulk bag, comprises a discharge spout coupled to a bottom panel of the bag, wherein the discharge spout is configured to be rolled. A releasable flexible fabric tape or tie secures the discharge spout in rolled configuration to the bottom panel to define a closed configuration for the discharge spout. In the closed configuration, material contents of the bag are contained within the bag. When contents of the bag are ready to be discharged, releasing the tape or tie causes the discharge spout to unroll and materials contained in the bag will flow therethrough. A discharge tube cover can also be provided that extends across the bottom panel and discharge tube. The discharge tube cover helps provide a flatter surface for the bag to rest upon, provides another level of closure to help prevent material contents of the bag from leaking, and can provide additional support and strength to the bag.